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Telomere Length and Telomerase Activity; A Yin and Yang of Cell Senescence
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Multiple Mechanisms Contribute To Telomere Maintenance.

Tammy A Morrish1, Dulat Bekbolysnov2, David Velliquette1

  • 1Department of Biochemistry and Cancer Biology, University of Toledo, Toledo, OH 43614, USA.

Journal of Cancer Biology & Research
|October 7, 2014
PubMed
Summary

Tumor growth relies on telomere maintenance, often via telomerase. Alternative recombination mechanisms also maintain telomeres, especially in tumors lacking telomerase, and may involve DNA repair pathways.

Keywords:
DNA repairRetrotransposonsTelomereTumors

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Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Tumor cell proliferation depends on maintaining telomeres, the protective caps of chromosomes.
  • Telomerase is the primary enzyme for telomere maintenance, but alternative recombination-based pathways exist.
  • Understanding these alternative mechanisms is crucial as some tumors lack telomerase yet maintain telomeres.

Purpose of the Study:

  • To review telomere recombination mechanisms.
  • To explore the role of recombination in telomere maintenance in tumors.
  • To investigate the potential contribution of L1 retrotransposition to telomere maintenance in telomerase-deficient tumors.

Main Methods:

  • Literature review of telomere maintenance mechanisms.
  • Analysis of studies on recombination-based telomere maintenance in model organisms and human tumors.
  • Discussion of the interplay between DNA repair pathways and telomere maintenance.

Main Results:

  • Telomere maintenance is essential for unlimited tumor growth.
  • Recombination-based mechanisms contribute to telomere maintenance, particularly in telomerase-negative tumors.
  • Altered DNA repair pathways may be involved in telomere recombination and could influence tumor resistance to DNA damaging agents.

Conclusions:

  • Telomere recombination is a critical alternative to telomerase for maintaining telomeres in cancer.
  • Investigating telomere recombination pathways may reveal new therapeutic strategies targeting tumor growth.
  • L1 retrotransposition is a potential, yet understudied, contributor to telomere maintenance in specific cancer contexts.